#1**+1 **

y -100x = 200

Ih he sells no computers, x =0 .....so....

y - 100 (0) = 2000

y = 2000

3x - 3y = 15 divide through by 3

x - y = 5 add y to both sides and subtract 5 from both sides

x - 5 = y

Associative property

CPhill
Sep 19, 2017

#2